“Segment-leading power is great, but it’s not the only thing that
makes the new Duramax a winner,” said Gary Arvan, Duramax chief
engineer. “We designed the engine to make that power with less fuel and
fewer emissions, while also increasing its durability.”

A slightly different version of the 6.6L Duramax is offered in
Silverado HD chassis and box-delete models. It is based on the same
improved architecture and includes most of the same features as the
pickup version, but is engineered to meet federal certification
standards for incomplete vehicles, including the incorporation of a
robust EGR system. It is rated at 335 horsepower (249 kW) at 3,100 rpm
and 685 lb.-ft. of torque (928 Nm) at 1,600 rpm.

Among the 2011 6.6L Duramax turbo diesel’s new and enhanced features are:

Main bearing profiles changed to enhance oil film thickness

Oil pump flow increased for more pressure at low speeds

A revised turbocharger oil circuit for increased pressure at the turbo and faster oil delivery

The more powerful 6.6L Duramax is also more fuel-efficient – up to
11-percent greater highway fuel economy than the outgoing model –
reduces NOx emissions by up to 63 percent and helps enable greater
towing ratings. Silverado 3500HD equipped with a fifth wheel hitch can
tow up to 20,000 pounds (9,072 kg). The increased fuel efficiency,
combined with a new, 36-gallon (136 L) fuel tank, provides up to 680
miles (1,090 km) of highway driving between fill-ups.

With nearly 1.3 million Duramax diesel engines put into operation
since its launch in 2000, no other automaker has as much diesel engine
development experience for meeting the demands of the heavy-duty truck
customer.

Strong small-block 6.0L V-8

The standard engine in Silverado HD trucks is the Vortec 6.0L
small-block V-8, which is enhanced for 2011 with greater idle
refinement. It is rated at 360 horsepower (268 kW) at 5,400 rpm and 380
lb.-ft. (515 Nm) at 4,200 rpm in Silverado 2500HD and 3500HD pickup
models. In chassis cab and box-delete models, as well as pickups with a
GVWR greater than 10,000 pounds, it is rated at 322 horsepower (240 kW)
at 4,400 rpm and 380 lb.-ft. (515 Nm) at 4,200 rpm.

Approximately 90 percent of the Vortec 6.0L’s peak torque is
available by only 2,000 rpm and excellent fuel economy is enabled by
the engine’s low-friction OHV configuration and cam phasing. The
state-of-the-art small-block architecture of the Vortec 6.0L – known
commonly as the “LS” family – delivers great strength, smoothness and
durability.

Whether equipped with the 6.6L Duramax or the small-block 6.0L, all
2011 Silverado models work under the best warranty coverage in America
– a five-year/100,000-mile limited powertrain warranty, plus roadside
assistance, courtesy transportation and other features that provide
assurance that Chevrolet backs its trucks for everything the road
offers.

Ford will introduce nine new or upgraded engines and six
new transmissions in North America this year as part of a five-year
effort to overhaul its entire global powertrain portfolio, which totals
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